Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 06-12-2021 and time 01:15:41 (Italy) in region 5 km SW Roccafluvione (AP)

A magnitude ML 0.9 earthquake occured in region: 5 km SW Roccafluvione (AP), on

  • 06-12-2021 00:15:41 (UTC)
  • 06-12-2021 01:15:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8350, 13.4320 at 17 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Roccafluvione AP 5 2010 2010
Venarotta AP 7 2066 4076
Acquasanta Terme AP 8 2916 6992
Palmiano AP 8 196 7188
Montegallo AP 8 523 7711
Montemonaco AP 11 604 8315
Ascoli Piceno AP 12 49407 57722
Valle Castellana TE 12 977 58699
Arquata del Tronto AP 13 1178 59877
Comunanza AP 14 3166 63043
Montefortino FM 14 1178 64221
Force AP 15 1354 65575
Folignano AP 17 9241 74816
Rotella AP 17 906 75722
Montefalcone Appennino FM 17 424 76146
Amandola FM 17 3629 79775
Rocca Santa Maria TE 18 537 80312
Smerillo FM 19 365 80677
Castignano AP 19 2796 83473
Montedinove AP 20 488 83961

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of Teramo (54892 inhabitants)
54 Km N of L'Aquila (69753 inhabitants)
61 Km E of Foligno (57155 inhabitants)
69 Km NW of Montesilvano (53738 inhabitants)
71 Km E of Terni (111501 inhabitants)
76 Km NW of Pescara (121014 inhabitants)
81 Km NW of Chieti (51815 inhabitants)
87 Km S of Ancona (100861 inhabitants)
90 Km E of Perugia (166134 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 0.9 2021-12-06
00:15:41		 42.8352 13.4318 17 2022-03-30
13:04:32		 Bollettino Sismico Italiano INGV 100269281
Reviewed
Rev100 		ML 0.9 2021-12-06
00:15:41		 42.8412 13.4247 19 2021-12-06
00:43:30		 Sala Sismica INGV-Roma 98196021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-06 00:15:41 ± 0.14
Latitude 42.8352 ± 0.0036
Longitude 13.4318 ± 0.0086
Depth (km) 17 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 100269281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 506
Semi-minor axis of confidence ellipse (meter) 485
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 304
Circular confidence region, given by single value of horizontal uncertainty (meter) 510.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 190
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34894
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 98196021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-06 00:43:30

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 100269281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-28 12:34:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MGAB.HHZ. 2021-12-06T00:16:00.37 3.0 negative manual P 0.02 0
IV.CSP1.EHZ. 2021-12-06T00:15:53.35 0.3 undecidable manual S 327 33.9438 105 0 73
IV.FDMO.HHZ. 2021-12-06T00:15:53.61 0.3 undecidable manual S 309 35.8419 104 -0.23 69
IV.NRCA.HHZ. 2021-12-06T00:15:51.32 0.3 undecidable manual S 270 25.8519 112 0.01 74
IV.MC2.EHZ. 2021-12-06T00:15:50.38 0.3 undecidable manual S 293 21.4674 118 0.13 73
IV.MF5.EHZ. 2021-12-06T00:15:49.29 0.3 undecidable manual S 8 17.0718 125 0.05 75
IV.FDMO.HHZ. 2021-12-06T00:15:48.56 0.1 undecidable manual P 309 35.8419 104 -0.12 94
IV.PF6.EHE. 2021-12-06T00:15:48.82 0.6 undecidable manual P 330 38.7279 103 -0.3 45
IV.CSP1.EHZ. 2021-12-06T00:15:48.53 0.3 undecidable manual P 327 33.9438 105 0.13 72
IV.MTRA.HNZ. 2021-12-06T00:15:47.56 0.3 undecidable manual S 198 9.1797 146 -0.2 75
IV.NRCA.HHZ. 2021-12-06T00:15:47.29 0.1 undecidable manual P 270 25.8519 112 0.07 98
IV.MF5.EHZ. 2021-12-06T00:15:46.19 0.1 undecidable manual P 8 17.0718 125 0.16 97
IV.MC2.EHZ. 2021-12-06T00:15:46.70 0.1 undecidable manual P 293 21.4674 118 0.09 98
IV.MTRA.HNZ. 2021-12-06T00:15:45.23 0.1 undecidable manual P 198 9.1797 146 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MC2.EHN. ML:0.9 0.00004434018 0.1 AML other m 2021-12-06T00:15:50.51
IV.MC2.EHE. ML:0.9 0.0000429499 0.1 AML other m 2021-12-06T00:15:50.83
IV.NRCA.HHE. ML:1.0 0.000045231355 0.2 AML other m 2021-12-06T00:15:51.55
IV.NRCA.HHN. ML:0.8 0.000030028591 0.1 AML other m 2021-12-06T00:15:52.90
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download